Gas-insulated switchgear rigid interlocking structure with grounding feed amount indication

Abstract

The invention provides an inflatable cabinet rigid interlocking structure with grounding feed quantity indication, which belongs to the technical field of gas insulated metal-enclosed switchgear and comprises a cabinet body, a front door opening limiter, a front and rear door interlocking part, a three-position switch and a circuit breaker interlocking mechanism. The front door opening limiter is arranged at the front end of the cable chamber and used for limiting opening and closing of the front cabinet door. The front and rear door interlocking member is used for interlocking control of the front cabinet door and the rear cabinet door. The three-position switch is arranged on the cabinet body, and a disconnecting link of the three-position switch is linked with the front and rear door interlocking piece through a grounding interlocking piece; and the circuit breaker interlocking mechanism is arranged on the cabinet body and is respectively linked with the front door opening limiter and the three-position switch. During operation, the three-position switch and the authority of the front door opening limiter can be unlocked through opening of the circuit breaker interlocking mechanism; after the three-position switch is grounded, the front and rear door interlocking piece is unlocked through the grounding interlocking piece; the front door opening limiter is operated to open the front cabinet door, and the front and rear door interlocking piece can be triggered to open the rear cabinet door. According to the invention, the operation safety and reliability of the gas-insulated switchgear are comprehensively improved.

Description

Technical Field

[0001] This invention belongs to the technical field of gas-insulated metal-enclosed switchgear, and more specifically, it relates to a rigid interlocking structure for a gas-insulated switchgear with grounding feed rate indication. Background Technology

[0002] Gas-insulated switchgear (GIs), also known as gas-insulated switchgear, is a compact power distribution device that uses insulating gases (such as sulfur hexafluoride, nitrogen, or dry air) as the main insulating medium. Its core design seals high-voltage live components within a metal casing, achieving high reliability and miniaturization through gas insulation. It is suitable for scenarios requiring high power supply stability and space utilization. In existing technologies, such as the mechanical lock interlocking system for the grounding switch of the gas-insulated switchgear disclosed in patent (application number: 202411949550.8), the interlocking control of the lower rear door panel is achieved through the mechanical linkage of the circuit breaker operating mechanism, the three-position operating mechanism, and the grounding interlocking device. The control logic of the circuit breaker and the interlocking rod is "when the circuit breaker is closed, the closing limit plate blocks the interlocking rod from moving downwards; when the circuit breaker is opened, they are staggered to release the three-position operating authority." While this improves the reliability of the mechanical interlocking, it still has many shortcomings. 1. Lack of grounding feed depth detection and indication, the grounding status cannot be directly observed, and the unlocking is based solely on the closed status of the three-position operating mechanism. The actual feed depth of the grounding knife cannot be detected, which poses a risk of insufficient grounding due to failure of the mechanism shaft connection or insufficient feed.

[0003] 2. The interlocking structure lacks stability. Using a single transmission link to achieve long-distance interlocking can easily lead to deformation or jamming during long-distance transmission, affecting the reliability of the interlocking.

[0004] 3. The front cabinet door has no interlock protection; the interlock is only designed for the lower rear door panel. The opening of the front cabinet door is not linked to the circuit breaker or grounding switch. If maintenance personnel accidentally operate the front cabinet door, they may come into contact with live parts.

[0005] 4. It lacks an interlocking self-holding function, and the interlocking state relies on spring reset to maintain it. During operation, external interference can easily cause the interlocking to be accidentally released, posing a safety hazard. Summary of the Invention

[0006] The purpose of this invention is to provide a rigid interlocking structure for a gas-filled cabinet with a grounding feed rate indicator, which aims to address at least one of the shortcomings of the prior art mentioned in the background section.

[0007] To achieve the above objectives, the technical solution adopted by the present invention is: to provide a rigid interlocking structure for a gas-insulated switchgear with grounding feed rate indication, comprising: The cabinet has a cable compartment at its lower part, and a front cabinet door and a rear cabinet door are respectively hinged to the front and rear ends of the cable compartment. A front door opening limiter is located at the front end of the cable compartment to restrict the opening and closing of the front cabinet door; A front and rear door interlock is provided in the cable room. One end of the front and rear door interlock is mechanically linked to the front door opening limiter, and the other end is provided with a rear door limiter. The rear door limiter is used to restrict the opening and closing of the rear cabinet door. A three-position switch is installed on the cabinet. The knife switch of the three-position switch is mechanically linked to the front and rear door interlocking components through a grounding interlocking component. A circuit breaker interlocking mechanism is provided on the cabinet, and the circuit breaker interlocking mechanism is mechanically linked with the front door opening limit switch and the three-position switch respectively; The circuit breaker interlocking mechanism is operated to unlock the three-position switch and the front door opening limit switch. When the three-position switch is in the grounded state, the three-position switch unlocks the front and rear door interlocking components through the grounding interlocking component. The operation of the front door opening limit switch opens the front cabinet door, triggering the operation of the front and rear door interlocking components, causing the rear door limit switch to open the rear cabinet door.

[0008] In one possible implementation, the front door opening limiter includes an operating panel and a circuit breaker interlocking shaft. The operating panel is slidably mounted on the cabinet body and has a plug plate. The front cabinet door has a slot corresponding to the plug plate. The plug plate is inserted into the slot to limit the opening and closing of the front cabinet door. One end of the circuit breaker interlocking shaft is fixed to the operating panel, and the other end is mechanically linked to the circuit breaker interlocking mechanism. The circuit breaker interlocking mechanism limits the sliding of the operating panel through the circuit breaker interlocking shaft.

[0009] In one possible implementation, the front and rear door interlocking components include an interlocking rod, which is laterally slidably disposed in the cable compartment via a support frame. The front end of the interlocking rod is provided with a first limiting part, and the rear end of the interlocking rod is connected to the cabinet body via an elastic element. A rear door limiter is disposed at the rear end of the interlocking rod. A first trigger part is provided on the operation panel corresponding to the first limiting part. A latch is provided on the rear cabinet door corresponding to the rear door limiter. When the rear cabinet door is closed, the latch presses against the interlocking rod and moves it to a first position towards the front cabinet door. The latch locks the rear door limiter, the elastic element deforms, and the first trigger part and the first limiting part enter a first engagement state, restricting the sliding of the interlocking rod.

[0010] In one possible implementation, the grounding interlock component includes a grounding support shaft slidably connected to the cabinet, a reset spring sleeved on the grounding support shaft, a support seat at one end of the grounding support shaft corresponding to the knife switch of the three-position switch, and a second trigger part at the other end of the grounding support shaft. A second limiting part is provided on the interlocking rod corresponding to the second trigger part. When the interlocking rod is in the first position, rotating the three-position switch to the grounding state causes the knife switch of the three-position switch to press against the support seat, driving the grounding support shaft to move and compress the reset spring, causing the second trigger part to avoid the second limiting part, and causing the interlocking rod to enter the unlocked state. Rotating the three-position switch to the closed or open state causes the knife switch of the three-position switch to move away from the support seat, the reset spring drives the grounding support shaft to reset, and the second trigger part cooperates with the second limiting part to restrict the movement of the interlocking rod.

[0011] In one possible implementation, when the three-position switch is in the grounded state and the front cabinet door is opened by sliding the operation panel, the elastic element drives the interlocking rod to move to the second position, and the first trigger part and the first limiting part enter the second cooperation state to maintain the position state of the operation panel and restrict the operation authority of the circuit breaker interlocking mechanism and the three-position switch.

[0012] In one possible implementation, the rear cabinet door is provided with an observation window for observing the position of the grounding support shaft.

[0013] In one possible implementation, the upper part of the cable compartment is provided with a circuit breaker gas chamber and a three-position gas chamber in sequence. The knife switch of the three-position switch is located in the three-position gas chamber. A first partition is provided between the cable compartment and the circuit breaker gas chamber. A second partition is provided between the circuit breaker gas chamber and the three-position gas chamber. The grounding support shaft runs longitudinally through and is slidably connected to the first partition and the second partition. Its upper end is located in the three-position gas chamber and its lower end is located in the cable compartment. The reset spring is located between the support seat and the second partition. A sealing element is provided between the grounding support shaft and the first partition and the second partition.

[0014] In one possible implementation, the sealing element is a sealing bellows sleeved on the grounding support shaft, with one end of the sealing bellows sealed to the grounding support shaft and the other end sealed to the first partition or the second partition.

[0015] In one possible implementation, a connecting frame is provided on the inner side of the rear cabinet door frame corresponding to the interlocking rod. The connecting frame includes a longitudinal plate. A first rod and a second rod are fixedly connected to the rear end of the interlocking rod, which are parallel to and spaced apart from each other. The first rod and the second rod both pass through and are slidably connected to the longitudinal plate. A stop is provided at the end of the first rod located outside the longitudinal plate. The elastic element passes through the first rod and is located between the longitudinal plate and the stop. The second rod is used to abut against the locking tongue.

[0016] In one possible implementation, the connecting frame includes a transverse plate located below the longitudinal plate. The rear door limiter is a hook hinged to the second rod, located outside the longitudinal plate with its hook facing outward and its lower end overlapping the outer edge of the transverse plate. The latch has a slot corresponding to the hook. The latch pushes the second rod to move the hook toward the transverse plate, and the transverse plate pushes the hook to rotate, so that the hook is inserted into the slot.

[0017] The beneficial effects of the rigid interlocking structure of the gas-insulated switchgear with grounding feed amount indication provided by this invention are as follows: Compared with the prior art, the rigid interlocking structure of the gas-insulated switchgear with grounding feed amount indication of this invention, through the cooperation of the grounding support shaft and the observation window of the rear cabinet door, converts the grounding feed amount of the three-position switch knife switch into a physical displacement that can be directly observed. Combined with the closed-loop mechanical verification of "knife switch action - grounding support shaft displacement - interlock unlocking", the hidden danger of false grounding is eliminated; the rigid multi-link transmission and "elastic reset + mechanical limit" composite structure are adopted to reduce the risk of deformation and jamming during long-distance transmission and improve the stability of interlocking; a triple access control mechanism for the front cabinet door (circuit breaker opening → grounding → circuit breaker closing) and a linkage unlocking mechanism between the front and rear doors are constructed to achieve dual safety protection; the mechanical locking of the first limit part and the first trigger part forms an interlocking self-holding function, which significantly enhances the resistance to external interference. Combined with the sealing bellows, the air chamber is sealed. At the same time, the standardized operation process and the visual design optimize the operation and maintenance efficiency, comprehensively improving the operational safety and reliability of the gas-insulated switchgear from a mechanical perspective. Attached Figure Description

[0018] To more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0019] Figure 1 This is a schematic diagram of the overall structure of a rigid interlocking structure for a gas-insulated cabinet with grounding feed amount indication, provided in an embodiment of the present invention. Figure 2 This is a right-side schematic diagram of a rigid interlocking structure for a gas-insulated cabinet with a grounding feed rate indicator, provided in an embodiment of the present invention. Figure 3 This is a schematic diagram of the structure when both doors are closed and the interlocking rod is in the first position, according to an embodiment of the present invention. Figure 4 This is a schematic diagram of the structure when both doors are open and the interlocking rod is in the second position, according to an embodiment of the present invention. Figure 5 for Figure 3 A magnified structural diagram at point N in the diagram; Figure 6 for Figure 4 A magnified structural diagram at point M in the diagram; Figure 7 A schematic diagram of the interlocking structure between the rear door limiter and the rear cabinet door is provided for an embodiment of the present invention.

[0020] Explanation of reference numerals in the attached figures: 1. Cabinet; 101. Cable compartment; 102. Circuit breaker gas compartment; 103. Three-position gas compartment; 11. Front door; 12. Rear door; 121. Locking tongue; 1211. Slot; 13. Fixed bracket; 14. Connecting frame; 141. Longitudinal plate; 142. Transverse plate; 15. Support frame; 2. Circuit breaker interlocking mechanism; 3. Three-position switch; 4. Front door opening limit switch; 41. Operation panel; 411. Extension 42. Circuit breaker interlocking shaft; 43. Insert plate; 44. Operating handle; 45. First trigger part; 5. Interlocking rod; 51. First limit part; 52. Second limit part; 53. First rod body; 531. Stop block; 54. Second rod body; 55. Elastic element; 6. Grounding support shaft; 61. Support seat; 62. Return spring; 63. Second trigger part; 64. Sealing bellows; 7. Hook; 8. Observation window. Detailed Implementation

[0021] To make the technical problems to be solved, the technical solutions, and the beneficial effects of the present invention clearer, the present invention will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present invention and are not intended to limit the present invention.

[0022] It should be noted that when a component is referred to as being "fixed to" or "set on" another component, it can be directly on or indirectly on that other component. When a component is referred to as being "connected to" another component, it can be directly connected to or indirectly connected to that other component.

[0023] It should be understood that the terms "length", "width", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the present invention.

[0024] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this invention, "a plurality of" means two or more, unless otherwise explicitly specified.

[0025] Please see Figures 1 to 7 This invention provides a rigid interlocking structure for a gas-insulated switchgear with grounding feed amount indication. The rigid interlocking structure includes a cabinet body 1, a front door opening limiter 4, front and rear door interlocking components, a three-position switch 3, and a circuit breaker interlocking mechanism 2. A cable compartment 101 is located at the lower part of the cabinet body 1. A front door 11 and a rear door 12 are hinged to the front and rear ends of the cable compartment 101, respectively. The front door opening limiter 4 is located at the front end of the cable compartment 101 to restrict the opening and closing of the front door 11. The front and rear door interlocking components are located inside the cable compartment 101. One end of the front and rear door interlocking components is mechanically linked to the front door opening limiter 4, and the other end is equipped with a rear door limiter to restrict the opening and closing of the rear door 12. The three-position switch 3 and circuit breaker interlocking mechanism 2... The three-position switch 3 is located on the cabinet 1. The knife switch of the three-position switch 3 is mechanically linked to the front and rear door interlocking components through the grounding interlocking component. The circuit breaker interlocking mechanism 2 is located on the cabinet 1. The circuit breaker interlocking mechanism 2 is mechanically linked to the front door opening limit switch 4 and the three-position switch 3 respectively. During operation, operating the circuit breaker interlocking mechanism 2 can unlock the operation permissions of the three-position switch 3 and the front door opening limit switch 4. When the three-position switch 3 is in the grounded state, the three-position switch 3 can unlock the front and rear door interlocking components through the grounding interlocking component. Operating the front door opening limit switch 4 to open the front cabinet door 11 can trigger the unlocked front and rear door interlocking components to open the rear door limit switch 12.

[0026] In this embodiment, the mechanical linkage structure between the circuit breaker interlocking mechanism 2, the three-position switch 3, and the front door opening limit switch 4 is a conventional technology in the industry, which is described in detail in the patent (application number: 202411949550.8), and will not be repeated here. The mechanical linkage relationship between the circuit breaker interlocking mechanism 2, the three-position switch 3, and the front door opening limit switch 4 can be summarized as follows: when the circuit breaker interlocking mechanism 2 is in the open state, the operation permission of the three-position switch 3 is unlocked. After the three-position switch 3 is operated to the closed state, the operation permission of the front door opening limit switch 4 is unlocked.

[0027] In this embodiment, a fixed bracket 13 is provided on the upper side of the front door 11 at the front end of the cabinet 1. The aforementioned front door opening limiter 4 includes an operating plate 41 and a circuit breaker interlocking shaft 42. The operating plate 41 is slidably mounted on the fixed bracket 13 via a sliding fit structure (slider and groove). The operating plate 41 is provided with an operating handle 44 that penetrates the cabinet 1 and extends to the outside of the cabinet 1. The lower end of the operating plate 41 is provided with an insert plate 43, and a slot is provided on the front door 11 corresponding to the insert plate 43. An extension frame 411 extends inward from the inner side of the operating plate 41. The aforementioned circuit breaker interlocking shaft 42 is arranged longitudinally, with its lower end fixed to the extension frame 411, and its middle part slidably mounted inside the cabinet 1 via a support frame 15. In this embodiment, the circuit breaker interlocking mechanism 2 controls the operating authority of the operating plate 41 by controlling the up and down movement of the circuit breaker interlocking shaft 42. The mechanical interlocking structure between the circuit breaker interlocking mechanism 2 and the circuit breaker interlocking shaft 42 is described in detail in the patent (application number: 202411949550.8), and will not be repeated here. The implementation steps are as follows: when the three-position switch 3 is in the closed position, the circuit breaker interlocking mechanism 2 is closed, and the circuit breaker interlocking shaft 42 is unlocked. The operating plate 41 can be operated up and down by operating handle 44. Sliding the operating plate 41 upwards will cause the insert plate 43 at its lower end to disengage from the slot of the front cabinet door 11, so that the front cabinet door 11 can be opened.

[0028] In this embodiment, please refer to Figures 1 to 7The aforementioned front and rear door interlocking components include an interlocking rod 5, which is laterally slidably mounted in the cable compartment 101 via a support frame 15. The end of the interlocking rod 5 facing the front cabinet door 11 is the front end, and the end facing the rear cabinet door 12 is the rear end. The front end has a first limiting part 51, and the rear end is connected to the cabinet body 1 via an elastic element 55. A rear door limiter is located at the rear end of the interlocking rod 5. A first trigger part 45 is provided on the extension frame 411 corresponding to the first limiting part 51, and a locking tongue 121 is provided on the rear cabinet door 12 corresponding to the rear door limiter. In application… When the rear cabinet door 12 is closed, the rear cabinet door 12 drives the locking tongue 121 to press against the rear end of the interlocking rod 5, causing the interlocking rod 5 to move to the first position on the front cabinet door 11 side, locking the locking tongue 121 with the rear door limiter, and causing the elastic member 55 to undergo elastic deformation. At this time, the first trigger part 45 and the first limit part 51 enter the first cooperation state, that is, the first limit part 51 is located between the first trigger part 45 and the operation plate 41, and the side of the first trigger part 45 and the first limit part 51 abut against each other, restricting the interlocking rod 5 from sliding towards the rear cabinet door 12.

[0029] In this embodiment, please refer to Figures 1 to 7 A connecting frame 14 is provided on the inner side of the door frame of the rear cabinet door 12, corresponding to the interlocking rod 5. The connecting frame 14 includes a longitudinal plate 141. A first rod 53 and a second rod 54, which are parallel to and spaced apart from the interlocking rod 5, are fixedly connected to the rear end of the interlocking rod 5. The first rod 53 and the second rod 54 both pass through and slide through the longitudinal plate 141. A stop block 531 is provided at the end of the first rod 53 located outside the longitudinal plate 141. The elastic element 55 is a helical spring that passes through the first rod 53 and is located between the longitudinal plate 141 and the stop block 531. The connecting frame 14 also includes a transverse plate 142. In this embodiment, the transverse plate 142 is integrally formed below the longitudinal plate 141. The rear door limiter is hinged to the second rod 54. The hook 7 is located on the outside of the longitudinal plate 141, with its hook facing outwards. Its lower end overlaps the outer edge of the transverse plate 142. A slot 1211 is provided on the latch 121 corresponding to the hook 7. In application, when the rear cabinet door 12 is closed, the latch 121 abuts against and pushes the second rod 54 to move. In turn, the second rod 54 drives the first rod 53 and the interlocking rod 5 to move synchronously. At the same time, the movement of the second rod 54 also drives the hook 7 to move towards the transverse plate 142. This allows the transverse plate 142 to push the bottom of the hook 7 in the opposite direction, causing the hook 7 to rotate upwards towards the latch 121, so that the hook of the hook 7 is inserted into the slot 1211, thus locking the hook 7 with the latch 121.

[0030] In this embodiment, please refer to Figures 1 to 4A circuit breaker chamber 102 and a three-position chamber 103 are sequentially arranged on the upper part of the cable chamber 101. The knife switch of the three-position switch 3 is located in the three-position chamber 103. A first partition is provided between the cable chamber 101 and the circuit breaker chamber 102, and a second partition is provided between the circuit breaker chamber 102 and the three-position chamber 103. The grounding interlocking component includes a grounding support shaft 6. In this embodiment, the grounding support shaft 6 extends longitudinally and is slidably connected to the first partition and the second partition. Its upper end is located in the three-position chamber 103, and its lower end is located in the cable chamber 101. A support seat 61 is provided at the upper end of the grounding support shaft 6 corresponding to the knife switch of the three-position switch 3. A return spring 62 is also fitted on it. The return spring 62 is located between the support seat 61 and the second partition. The lower end is provided with a second trigger part 63, and the interlocking rod 5 is provided with a second limit part 52 corresponding to the second trigger part 63. In application, when the interlocking rod 5 is in the first position, rotating the three-position switch 3 to the grounding state can cause the knife switch of the three-position switch 3 to press against the support seat 61, drive the grounding support shaft 6 to move downward, compress the reset spring 62, and cause the second trigger part 63 to move downward to avoid the second limit part 52, so that the interlocking rod 5 enters the unlocked state; rotating the three-position switch 3 to the closed or open state can cause the knife switch of the three-position switch 3 to move away from the support seat 61, and the compressed reset spring 62 will drive the grounding support shaft 6 to move upward to reset, so that the second trigger part 63 at the lower end of the grounding support shaft 6 blocks one side of the second limit part 52. The two cooperate with each other to restrict the horizontal movement of the interlocking rod 5.

[0031] When the three-position switch 3 is in the grounded state, and the sliding operation plate 41 opens the front cabinet door 11, the elastic element 55 drives the interlocking rod 5 to move to the second position on the rear cabinet door 12 side. As the interlocking rod 5 moves, the second rod body 54 at the rear end of the interlocking rod 5 pushes the locking tongue 121 to move to the rear cabinet door 12 side. The hook 7 hinged on the second rod body 54 rotates downward as the second rod body 54 moves, so that its hook part disengages from the slot 1211 of the locking tongue 121, releasing the lock with the locking tongue 121, and the rear cabinet door 12 can be opened. At this time, the first limiting part 51 at the front end of the interlocking rod 5 and the first trigger part 45 on the extension frame 411 enter the second cooperation state. The first trigger part 45 is located at the upper end of the first limiting part 51. The first limiting part 51 supports the first trigger part 45 to maintain the position of the operation plate 41, and restricts the operation authority of the circuit breaker interlocking mechanism 2 and the three-position switch 3 through the interlocking structure of the circuit breaker interlocking shaft 42 and the circuit breaker interlocking mechanism 2.

[0032] In this embodiment, to prevent gas leakage in the circuit breaker gas chamber 102 and the three-position gas chamber 103, a sealing element is provided between the grounding support shaft 6 and the first partition and the second partition. In this embodiment, both sealing elements are located inside the circuit breaker gas chamber 102. The sealing element is a sealing bellows 64 sleeved on the grounding support shaft 6. One end of the sealing bellows 64 is sealed to the support shaft, and the other end is sealed to the first partition or the second partition.

[0033] In this embodiment, an observation window 8 is provided on the rear cabinet door 12. Before the front cabinet door 11 and the rear cabinet door 12 are opened, the relative positions of the second trigger block at the lower end of the grounding support shaft 6 and the second limiting part 52 on the interlocking rod 5 can be seen through the observation window 8. By observing the position change of the second trigger block, it can be intuitively determined whether the knife switch of the three-position switch 3 is in the grounding position.

[0034] In application, the operating steps of the rigid interlocking structure for a gas-filled cabinet with grounding feed amount indication provided by this invention are as follows: Power outage unlocking steps: S11. Operate the circuit breaker interlocking mechanism 2 to open the circuit breaker and unlock the operation authority of the three-position switch 3. S12. Operate the three-position switch 3 to put it in the grounding state, so that the second trigger part 63 on the grounding support shaft 6 moves downward to avoid the second limit part 52 of the interlocking rod 5, and unlock the front and rear door interlocking parts. The position of the grounding support shaft 6 can be observed through the observation window 8 of the rear cabinet door 12 to confirm whether the knife switch of the three-position switch 3 is in the grounding position. S13. The circuit breaker interlocking mechanism 2 is closed, unlocking the operation authority of the front door opening limit switch 4. At this time, the interlocking rod 5 is in the first position. The operating plate 41 is pulled up to unlock the front cabinet door 11. At the same time, the first trigger part 45 on the operating plate 41 moves upward to avoid the first limit part 51 of the interlocking rod 5. Under the action of the elastic element 55 at its rear end, the interlocking rod 5 moves towards the rear cabinet door 12, causing the hook 7 on the second rod body 54 to rotate downward and disengage from the slot 1211 of the locking tongue 121, unlocking the rear cabinet door 12. At this time, the interlocking rod 5 is in the second position. The operating plate 41 is supported on the first limit part 51 by the first trigger part 45, keeping the operating plate 41 in position and restricting the operation authority of the circuit breaker interlocking mechanism 2 and the three-position switch 3.

[0035] Power-on interlocking procedure: S21. Close the rear cabinet door 12, so that the locking tongue 121 pushes the interlocking rod 5 to the front cabinet door 11 side with the help of the second rod 54. The second rod 54 moves from the second position to the first position. The second rod 54 at the rear end of the interlocking rod 5 moves to the front cabinet door 11 side, causing the hook 7 to rotate upward and insert into the slot 1211 of the locking tongue 121, so that the rear cabinet door 12 is locked. The first limiting part 51 at the front end of the interlocking rod 5 moves forward to the side of the first trigger part 45, avoiding the first trigger part 45. The first trigger part 45 loses support, and under the action of gravity, the operating plate 41 automatically slides down, so that the insert plate 43 at its lower end is inserted into the slot of the front cabinet door 11, and the front cabinet door 11 is locked. After the operating plate 41 slides down, it unlocks the operating authority of the circuit breaker interlocking mechanism 2 and the three-position switch 3 through the circuit breaker interlocking shaft 42. S22. First, operate the circuit breaker interlocking mechanism 2 to open, unlock the operation authority of the three-position switch 3, and then operate the three-position switch 3 to the closed position. The disconnector of the three-position switch 3 moves away from the support seat 61 at the upper end of the grounding support shaft 6. The grounding support shaft 6 moves upward under the action of the reset spring 62, so that the second trigger part 63 at the lower end of the grounding support shaft 6 blocks one side of the second limit part 52 of the interlocking rod 5, restricting the horizontal movement of the interlocking rod 5 and locking the interlocking rod 5. S23, Operate the circuit breaker interlocking mechanism 2 to close.

[0036] This invention provides a rigid interlocking structure for a gas-filled cabinet with a grounding feed amount indicator. Compared with existing technologies, by setting an observation window 8 on the rear cabinet door 12, the relative position of the second trigger part 63 at the lower end of the grounding support shaft 6 and the second limiting part 52 on the interlocking rod 5 can be directly observed, allowing direct determination of whether the knife switch of the three-position switch 3 is fully grounded. When the knife switch is grounded, the support seat 61 is pressed down, and the grounding support shaft 6 moves down, causing the second trigger part 63 to avoid the second limiting part 52, unlocking the interlocking rod 5; conversely, when the knife switch is not fully grounded, the second trigger part 63 blocks the second limiting part 52, restricting the movement of the interlocking rod 5. This mechanical linkage design transforms the grounding depth into an observable physical displacement, completely solving the unreliability of traditional technologies that rely solely on the operating mechanism status to determine grounding, and avoiding the risk of insufficient grounding due to failure of the mechanism shaft connection or insufficient feed.

[0037] By setting up a direct linkage between the grounding interlock (grounding support shaft 6) and the front and rear door interlocks (interlock rod 5), a closed-loop verification of "knife switch action - support shaft displacement - interlock unlocking" is formed. Only when the knife switch actually completes the grounding action (the support seat 61 is pressed down) will the grounding support shaft 6 move down to unlock the interlock rod 5, at which point the front and rear doors can be operated. This design strongly binds the grounding state with the interlock unlocking, mechanically eliminating the hidden danger of "false grounding," and is more physically reliable than the traditional interlocking logic that only relies on the state of the operating mechanism.

[0038] After the control panel 41 opens the front cabinet door 11, the first limiting part 51 at the front end of the interlocking rod 5 supports the first trigger part 45 on the control panel 41, forming a mechanical lock and keeping the control panel 41 in the unlocked position. This self-holding mechanism does not rely on spring reset, and will not accidentally release the interlock even if subjected to external force, greatly improving reliability.

[0039] When power is supplied and interlocked, closing the rear cabinet door 12 automatically triggers the front cabinet door 11 to lock. Furthermore, the circuit breaker must be tripped before the three-position switch 3 can be released from its lock, thus avoiding the risk of accidental power supply. This mandatory process of "locking when the door is closed and tripping when unlocking" standardizes the operation steps through mechanical interlocking, significantly reducing the probability of human error.

[0040] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A rigid interlocking structure of an air insulated switchgear with ground approach indication, characterized by, The utility model relates to a kind of cabinet, including: Cabinet (1), the lower part of the cabinet (1) is equipped with cable chamber (101), the front and rear ends of the cable chamber (101) are respectively hinged with front cabinet door (11) and rear cabinet door (12); Front door opening stopper (4) is equipped in the front end of the cable chamber (101), for limiting the opening and closing of the front cabinet door (11); Front and rear door interlock is equipped in the cable chamber (101), one end of the front and rear door interlock is mechanically linked with the front door opening stopper (4), and the other end is equipped with rear door stopper, and the rear door stopper is used to limit the opening and closing of the rear cabinet door (12); Three-position switch (3) is equipped on the cabinet (1), and the knife gap of the three-position switch (3) is mechanically linked with the front and rear door interlock through grounding interlock; Circuit breaker interlocking mechanism (2) is equipped on the cabinet (1), and the circuit breaker interlocking mechanism (2) is mechanically linked with the front door opening stopper (4) and the three-position switch (3) respectively; The three-position switch (3) is unlocked by the grounding interlock when the three-position switch (3) is in the grounding state by unlocking the three-position switch (3), the front door opening stopper (4) when operating the circuit breaker interlocking mechanism (2), operating the front cabinet door (11) by the front door opening stopper (4) and the rear cabinet door (12) are opened by the rear door stopper, and the rear cabinet door (12) is opened by the rear door stopper, and the rear cabinet door (12) is opened by the rear door stopper.

2. A gassing cabinet rigid interlocking structure with a ground feed rate indication as claimed in claim 1, characterized in that, The front door opening stopper (4) includes operating plate (41) and circuit breaker interlocking shaft (42), the operating plate (41) is slidably arranged on the cabinet (1), the operating plate (41) is equipped with plug-in board (43), the front cabinet door (11) is equipped with slot corresponding to the plug-in board (43), the plug-in board (43) and the slot are inserted and assembled, for limiting the opening and closing of the front cabinet door (11), one end of the circuit breaker interlocking shaft (42) is fixedly connected to the operating plate (41), and the other end is mechanically linked with the circuit breaker interlocking mechanism (2), and the circuit breaker interlocking mechanism (2) limits the sliding of the operating plate (41) by the circuit breaker interlocking shaft (42).

3. A gassing cabinet rigid interlocking structure with a ground feed rate indication as claimed in claim 2, characterized in that, The front and rear door interlocking piece comprises an interlocking rod (5) which is transversely slidably arranged in the cable chamber (101) through a support frame (15), the front end of the interlocking rod (5) is provided with a first limiting part (51), the rear end of the interlocking rod (5) is connected to the cabinet body (1) through an elastic member (55), the rear door limiter is arranged at the rear end of the interlocking rod (5), a first trigger part (45) corresponding to the first limiting part (51) is arranged on the operation plate (41), a lock tongue (121) corresponding to the rear door limiter is arranged on the rear cabinet door (12), when the rear cabinet door (12) is closed, the lock tongue (121) abuts against the interlocking rod (5) to move to a first position on the side of the front cabinet door (11), the lock tongue (121) is locked by the rear door limiter, the elastic member (55) is deformed, and the first trigger part (45) and the first limiting part (51) enter a first cooperation state to limit the sliding of the interlocking rod (5).

4. A gassing cabinet rigid interlocking structure with a ground feed rate indication as claimed in claim 3, characterized in that, The grounding interlocking piece comprises a grounding support shaft (6) which is slidably connected to the cabinet body (1), a reset spring (62) is arranged on the grounding support shaft (6), a supporting seat (61) corresponding to the knife switch of the three-position switch (3) is arranged at one end of the grounding support shaft (6), a second trigger part (63) is arranged at the other end of the grounding support shaft (6), and a second limiting part (52) corresponding to the second trigger part (63) is arranged on the interlocking rod (5), when the interlocking rod (5) is in the first position, the three-position switch (3) is rotated to the grounding state, the knife switch of the three-position switch (3) abuts against the supporting seat (61) to drive the grounding support shaft (6) to move and compress the reset spring (62), the second trigger part (63) avoids the second limiting part (52), and the interlocking rod (5) enters an unlocked state; when the three-position switch (3) is rotated to the closed or open state, the knife switch of the three-position switch (3) is away from the supporting seat (61), the reset spring (62) drives the grounding support shaft (6) to reset, the second trigger part (63) cooperates with the second limiting part (52) to limit the movement of the interlocking rod (5).

5. A gassing cabinet rigid interlocking structure with a ground feed rate indication as claimed in claim 4, characterized in that, When the three-position switch (3) is in the grounding state and the operation plate (41) is slid to open the front cabinet door (11), the elastic member (55) drives the interlocking rod (5) to move to a second position, the first trigger part (45) and the first limiting part (51) enter a second cooperation state to keep the position state of the operation plate (41) and limit the operation authority of the circuit breaker interlocking mechanism (2) and the three-position switch (3).

6. A gassing cabinet rigid interlocking structure with a ground feed rate indication as claimed in claim 4, characterized in that, The rear cabinet door (12) is provided with an observation window (8) for observing the position of the grounding support shaft (6).

7. A gassing chamber rigid interlocking structure with a ground feed rate indication as claimed in claim 4, characterized in that, The upper part of the cable compartment (101) is provided with a circuit breaker gas chamber (102) and a three-position gas chamber (103) in sequence. The knife switch of the three-position switch (3) is located in the three-position gas chamber (103). A first partition is provided between the cable compartment (101) and the circuit breaker gas chamber (102). A second partition is provided between the circuit breaker gas chamber (102) and the three-position gas chamber (103). The grounding support shaft (6) runs longitudinally through and slides between the first partition and the second partition. Its upper end is located in the three-position gas chamber (103), and its lower end is located in the cable compartment (101). The reset spring (62) is located between the support seat (61) and the second partition. A sealing element is provided between the grounding support shaft (6) and the first partition and the second partition.

8. A gassing cabinet rigid interlocking structure with a ground feed rate indication as claimed in claim 7, characterized in that, The sealing element is a sealing bellows (64) sleeved on the grounding support shaft (6). One end of the sealing bellows (64) is sealed to the grounding support shaft (6), and the other end is sealed to the first partition or the second partition.

9. A gassing cabinet rigid interlocking structure with a ground feed rate indication as claimed in claim 3, characterized in that, The inner side of the door frame of the rear cabinet door (12) is provided with a connecting frame (14) corresponding to the interlocking rod (5). The connecting frame (14) includes a longitudinal plate (141). The rear end of the interlocking rod (5) is fixedly connected with a first rod (53) and a second rod (54) that are parallel to each other and spaced apart. The first rod (53) and the second rod (54) both pass through and slide through the longitudinal plate (141). The first rod (53) is provided with a stop block (531) at one end outside the longitudinal plate (141). The elastic member (55) passes through the first rod (53) and is located between the longitudinal plate (141) and the stop block (531). The second rod (54) is used to abut against the locking tongue (121).

10. A gassing cabinet rigid interlocking structure with a ground feed rate indication as claimed in claim 9, characterized in that, The connecting frame (14) includes a transverse plate (142) located below the longitudinal plate (141). The rear door limiter is a hook (7) hinged to the second rod (54). The hook (7) is located outside the longitudinal plate (141), with its hook facing outward and its lower end overlapping the outer edge of the transverse plate (142). The latch (121) has a slot (1211) corresponding to the hook (7). The latch (121) pushes the second rod (54) to carry the hook (7) to the transverse plate (142). The transverse plate (142) pushes the hook (7) to rotate, so that the hook (7) is inserted into the slot (1211).

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